.header{
  width: 750px;
  height: 100px;
  position: relative;
  text-align: center;
  line-height: 100px;
  background: #008CFF;
  margin: 0 auto;
  
  h1 {
    color: #fff;
    font-size: 38px;
    font-weight: normal
  }
  .back{
    width: 36px;
    height: 28px;
    position: absolute;
    top: 36px;
    left: 34px;

    img {
      width: 36px;
      height: 28px;
      display: block;
    }
  }
  .home{
    position: absolute;
    top: 0;
    right: 34px;
    color: #fff;
    font-size: 32px;
  }
}
/* 首页 */
.container{
  max-width: 750px;
  padding-top: 56px;
  margin: 0 auto;
}
.nav{
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 0 60px;

  .nav-item{
    width: 304px;
    height: 246px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
    background-color: #fff;

    img {
      display: block;
      width: 72px;
      height: 72px;
    }
    span{
      margin-top: 32px;
      color: #4a4a4a;
      font-size: 28px;
    }
  }
}
/* 推荐课程 */
.course {
  padding: 0 30px;
  .course-item {
    width: 690px;
    display: block;
    padding: 50px 24px;
    margin-top: 20px;
    border: 1px solid #DCDCDC;
    background-color: #fff;
    
    .course-item-title {
      color: #4a4a4a;
      line-height: 44px;
      font-size: 32px;
    }
    .course-item-con {
      display: flex;
      justify-content: space-between;
      margin-top: 40px;
      color: #4a4a4a;
      font-size: 26px;
    }
  }
}
/* 排行榜 */
.rank {
  padding: 0 30px;
  text-align: center;

  .thead {
    tr {
      height: 75px;
      td {
        font-size: 24px;
        color: #4A4A4A;
      }
    }
  }
  .tbody {
    tr {
      height: 120px;   
      background-color: #FFFFFF;
      border: 1px solid #DCDCDC;
      border-radius: 8px;
      td {
        font-size: 28px;
        color: #0E9BFF;
      }
      td:first-child {
        width: 100px;
        text-align: center;
        .first {
          width: 66px;
          height: 60px;
          margin-left: 17px;
          background: url('/static/images/cup.png');
          background-size: 100% 100%;
          background-repeat: no-repeat;
        }
        .orderno {
          width: 40px;
          height: 40px;
          margin-left: 30px;
          line-height: 40px;
          border-radius: 50%;
          background-color: #FFAA1E;
          color: #fff;
        }
      }
    }
    .spacing {
      height: 16px;
      background-color: #f4f4f4;
      border: 0;
      border-radius: 0;
    }
  }
  
}
/* 系统帮助 */
.system {
  padding-left: 28px;
  background-color: #fff;

  .system-title {
    height: 100px;
    line-height: 100px;
    color: #050505;
    font-size: 30px;
  }
  .system-text {
    padding: 20px 0 30px 0;
    font-size: 28px;
    color: #848689;

    p {
      margin-bottom: 20px;
    }
  }
}
